Bought one about 8 years ago, started using it and really liked it. I have somewhat of a thicker torso, so it works for me. I know guys who have small waists don't prefer it, especially for deadlifts.
Never used one ever.
I guess if you need one then you should have one OR you could just wear one around the gym all the time with your foot up on the bench yakking with your buddies like some jerk offs do.:dbells: